Semiconductor construct and manufacturing method thereof as well as semiconductor device and manufacturing method thereof

ABSTRACT

A semiconductor construct includes a semiconductor substrate and connection pads provided on the semiconductor substrate. Some of the connection pads are connected to a common wiring and at least one of the remaining of the connection pads are connected to a wiring. The construct also includes a first columnar electrode provided to be connected to the common wiring and a second columnar electrode provided to be connected to a connection pad portion of the wiring.

CROSS-REFERENCE TO RELATED APPLICATIONS

This is a Continuation application of U.S. application Ser. No.13/960,485, filed Aug. 6, 2013, which is a Continuation application ofU.S. application Ser. No. 12/828,492, filed Jul. 1, 2010 and issued asU.S. Pat. No. 8,525,335, which is based upon and claims the benefit ofpriority from prior Japanese Patent Application No. 2009-158618, filedJul. 3, 2009; No. 2009-158622, filed Jul. 3, 2009; and No. 2009-158629,filed Jul. 3, 2009, the entire contents of all of which are incorporatedherein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

This invention relates to a semiconductor construct.

2. Description of the Related Art

Conventional semiconductor devices include a semiconductor device havinga semiconductor construct called a chip size package (CSP) that isfixedly attached to a base plate greater in size than the semiconductorconstruct (e.g., see Jpn. Pat. Appln. KOKAI Publication No. 2006-12885).In this case, the semiconductor construct called the CSP has a structurethat includes a semiconductor substrate, wirings provided on thesemiconductor substrate, columnar electrodes respectively provided onconnection pads of the wirings, and a sealing film provided around thecolumnar electrodes.

Furthermore, the lower surface of the semiconductor substrate of thesemiconductor construct is fixedly attached to the base plate. Aninsulating layer is provided on the base plate around the semiconductorconstruct. An upper insulating film is provided over the semiconductorconstruct and the insulating layer. Upper wirings are provided on theupper insulating film so as to be connected to the columnar electrodesof the semiconductor construct. The upper wirings, except for itsconnection pads, are covered with an overcoat film. Solder balls areprovided on the connection pads of the upper wirings (e.g., see Jpn.Pat. Appln. KOKAI Publication No. 2006-12885).

In the meantime, the columnar electrodes are respectively provided onthe connection pads of the wirings in the semiconductor construct of theabove-mentioned conventional semiconductor device. Thus, the relationbetween the wirings and the columnar electrodes is one-to-one. This is adisadvantage when the line width of the wirings is reduced to about 20μm or less due to an increase in the number of the wirings and columnarelectrodes. In this case, when an excessively high current originatingfrom, for example, a power supply voltage, runs through the wirings, thewirings are burned off and broken.

BRIEF SUMMARY OF THE INVENTION

According to an aspect of embodiments, a semiconductor constructincludes a semiconductor substrate, connection pads provided on thesemiconductor substrate, a common wiring provided in a region includinga predetermined number of connection pads among the connection pads soas to be connected to the predetermined number of connection pads, awiring provided to be connected to the remaining of the connection pads,a first columnar electrode provided to be connected to the commonwiring, and a second columnar electrode provided to be connected to aconnection pad portion of the wiring.

According to another aspect of embodiments, a method of manufacturing asemiconductor construct includes forming a common wiring and a wiring ona semiconductor substrate provided with connection pads, the commonwiring being formed in a region including common voltage connection padsamong the connection pads so as to be connected to the common voltageconnection pads, the wiring being formed so as to be connected to theremaining of the connection pads, and forming a first columnar electrodeon the common wiring, and forming a second columnar electrode on aconnection pad portion of the wiring.

Advantages of the invention will be set forth in the description whichfollows, and in part will be obvious from the description, or may belearned by practice of the invention. The advantages of the inventionmay be realized and obtained by means of the instrumentalities andcombinations particularly pointed out hereinafter.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The accompanying drawings, which are incorporated in and constitute apart of the specification, illustrate embodiments of the invention, andtogether with the general description given above and the detaileddescription of the embodiments given below, serve to explain theprinciples of the invention.

The present invention will be fully understood by the following detaileddescription and the accompanying drawings, which only serve to explainthe invention and do not limit the scope of the invention. In thedrawings:

FIG. 1 is a transmitted plan view of a semiconductor device according toa first embodiment of the invention;

FIG. 2 is a sectional view of a proper part of the semiconductor deviceshown in FIG. 1;

FIG. 3 is a sectional view of an initially prepared assembly in oneexample of a method of manufacturing the semiconductor device shown inFIG. 1 and FIG. 2;

FIG. 4 is a sectional view of a step following FIG. 3;

FIG. 5 is a sectional view of a step following FIG. 4;

FIG. 6 is a sectional view of a step following FIG. 5;

FIG. 7 is a sectional view of a step following FIG. 6;

FIG. 8 is a sectional view of a step following FIG. 7;

FIG. 9 is a sectional view of a step following FIG. 8;

FIG. 10 is a sectional view of a step following FIG. 9;

FIG. 11 is a sectional view of a step following FIG. 10;

FIG. 12 is a sectional view of a step following FIG. 11;

FIG. 13 is a sectional view of a step following FIG. 12;

FIG. 14 is a sectional view of a step following FIG. 13;

FIG. 15 is a sectional view of a step following FIG. 14;

FIG. 16 is a sectional view of a step following FIG. 15;

FIG. 17 is a sectional view of a step following FIG. 16;

FIG. 18 is a sectional view of a step following FIG. 17;

FIG. 19 is a transmitted plan view of a semiconductor device accordingto a second embodiment of the invention;

FIG. 20 is a sectional view of a proper part of the semiconductor deviceshown in FIG. 19;

FIG. 21 is a sectional view of an initially prepared assembly in oneexample of a method of manufacturing the semiconductor device shown inFIG. 19 and FIG. 20;

FIG. 22 is a sectional view of a step following FIG. 21;

FIG. 23 is a sectional view of a step following FIG. 22;

FIG. 24 is a sectional view of a step following FIG. 23;

FIG. 25 is a sectional view of a step following FIG. 24;

FIG. 26 is a sectional view of a step following FIG. 25;

FIG. 27 is a sectional view of a step following FIG. 26;

FIG. 28 is a sectional view of a step following FIG. 27;

FIG. 29 is a sectional view of a step following FIG. 28;

FIG. 30 is a sectional view of a step following FIG. 29;

FIG. 31 is a sectional view of a step following FIG. 30;

FIG. 32 is a sectional view of a step following FIG. 31;

FIG. 33 is a sectional view of a step following FIG. 32;

FIG. 34 is a sectional view of a step following FIG. 33;

FIG. 35 is a sectional view of a step following FIG. 34;

FIG. 36 is a sectional view of a step following FIG. 35;

FIG. 37 is a sectional view of a step following FIG. 36;

FIG. 38 is a transmitted plan view of a semiconductor device accordingto a third embodiment of the invention;

FIG. 39 is a sectional view of a proper part of the semiconductor deviceshown in FIG. 38;

FIG. 40 is a transmitted plan view of a semiconductor device accordingto a fourth embodiment of the invention;

FIG. 41 is a sectional view of a proper part of the semiconductor deviceshown in FIG. 40;

FIG. 42 is a sectional view of an initially prepared assembly in oneexample of a method of manufacturing the semiconductor device shown inFIG. 40 and FIG. 41;

FIG. 43 is a sectional view of a step following FIG. 42;

FIG. 44 is a sectional view of a step following FIG. 43;

FIG. 45 is a sectional view of a step following FIG. 44;

FIG. 46 is a sectional view of a step following FIG. 45;

FIG. 47 is a sectional view of a step following FIG. 46;

FIG. 48 is a sectional view of a step following FIG. 47;

FIG. 49 is a sectional view of a step following FIG. 48;

FIG. 50 is a sectional view of a step following FIG. 49;

FIG. 51 is a sectional view of a step following FIG. 50;

FIG. 52 is a sectional view of a step following FIG. 51;

FIG. 53 is a sectional view of a step following FIG. 52;

FIG. 54 is a sectional view of a step following FIG. 53;

FIG. 55 is a sectional view of a step following FIG. 54;

FIG. 56 is a sectional view of a step following FIG. 55;

FIG. 57 is a sectional view of a step following FIG. 56;

FIG. 58 is a transmitted plan view of a semiconductor device accordingto a fifth embodiment of the invention;

FIG. 59 is a sectional view of a proper part of the semiconductor deviceshown in FIG. 58;

FIG. 60 is a transmitted plan view of a semiconductor device accordingto a sixth embodiment of the invention; and

FIG. 61 is a sectional view of a semiconductor device according to aseventh embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION First Embodiment

FIG. 1 shows a transmitted plan view of a semiconductor device accordingto a first embodiment of the invention. FIG. 2 shows a sectional view ofa proper part of the semiconductor device shown in FIG. 1. Thissemiconductor device includes a base plate 1. The base plate 1 has asquare planar shape, and made of, for example, an epoxy resin containingglass fabric as a base material. The lower surface of a semiconductorconstruct 2 is bonded to the center of the upper surface of the baseplate 1 through a bonding layer 3 made of a die bond material. Thesemiconductor construct 2 has a square planar shape, and is slightlysmaller in size than the base plate 1.

The semiconductor construct 2, which is generally called a CSP, includesa silicon substrate (semiconductor substrate) 4. The lower surface ofthe silicon substrate 4 is bonded to the center of the upper surface ofthe base plate 1 through the bonding layer 3. Elements (not shown) suchas a transistor, diode, resistor, and condenser that constitute anintegrated circuit having a predetermined function are formed on theupper surface of the silicon substrate 4. Connection pads 5 a, 5 b, 5 care provided on the peripheral portion of the upper surface of thesilicon substrate 4. The connection pads 5 a, 5 b, 5 c are made of, forexample, an aluminum-based metal, and connected to the elements of theintegrated circuit.

Here, by way of example, the four connection pads indicated by the sign5 a and arranged on the upper left part of the silicon substrate 4 inFIG. 1 are for a common power supply voltage. The four connection padsindicated by the sign 5 b and arranged on the lower left part of thesilicon substrate 4 are for a common ground voltage. The four connectionpads indicated by the sign 5 c and arranged on the upper right part ofthe silicon substrate 4 and the four connection pads indicated by thesign 5 c and arranged on the lower right part of the silicon substrate 4are for a normal voltage. Here, in FIG. 2, the ground voltage connectionpads 5 b and associated parts are substantially similar to the powersupply voltage connection pads 5 a and associated parts, and aretherefore indicated by signs in parentheses.

A passivation film (insulating film) 6 made of, for example, siliconoxide is provided on the upper surface of the silicon substrate 4 exceptfor the peripheral portion of the silicon substrate 4 and the centers ofthe connection pads 5 a, 5 b, 5 c. The centers of the connection pads 5a, 5 b, 5 c are exposed through openings 7 a, 7 b, 7 c provided in thepassivation film 6. A protective film (insulating film) 8 made of, forexample, a polyimide resin is provided on the upper surface of thepassivation film 6. Openings 9 a, 9 b, 9 c are provided in parts of theprotective film 8 that correspond to the openings 7 a, 7 b, 7 c of thepassivation film 6.

Wirings 10 a, 10 b, 10 c are provided on the upper surface of theprotective film 8. The wirings 10 a, 10 b, 10 c have a double-layerstructure composed of foundation metal layers 11 a, 11 b, 11 c and uppermetal layers 12 a, 12 b, 12 c. The foundation metal layers 11 a, 11 b,11 c are made of, for example, copper and provided on the upper surfaceof the protective film 8. The upper metal layers 12 a, 12 b, 12 c aremade of copper and provided on the upper surfaces of the foundationmetal layers 11.

In this case, as shown in FIG. 1, the wiring indicated by the sign 10 a(common wiring) is solidly disposed on the upper left part of thesilicon substrate 4 in a region that has a square planar shape andincludes the four power supply voltage connection pads 5 a. The wiring10 a is connected to all of the four power supply voltage connectionpads 5 a via the openings 7 a, 9 a of the passivation film 6 and theprotective film 8.

The wiring indicated by the sign 10 b (common wiring) is solidlydisposed on the lower left part of the silicon substrate 4 in a regionthat has a square planar shape and includes the four ground voltageconnection pads 5 b. The wiring 10 b is connected to all of the fourground voltage connection pads 5 b via the openings 7 b, 9 b of thepassivation film 6 and the protective film 8.

The wirings indicated by the sign 10 c are disposed in the right regionof the silicon substrate 4. Each wiring 10 c has a connection portion 10c-1 connected to the normal voltage connection pad 5 c via the openings7 c, 9 c of the passivation film 6 and the protective film 8, aconnection pad portion 10 c-2 having a circular planar shape, and anextension line 10 c-3 extending between the connection portion 10 c-1and the connection pad portion 10 c-2.

Similarly to the wiring 10 a, a columnar electrode (common columnarelectrode, first columnar electrode) 13 a is solidly provided in theregion of the upper surface, except for its peripheral portion, of thewiring indicated by the sign 10 a and having a square planar shape. Thecolumnar electrode 13 a is made of copper and has a square planar shape.Similarly to the wiring 10 b, a columnar electrode (common columnarelectrode, first columnar electrode) 13 b is solidly provided in theregion of the upper surface, except for the peripheral portion, of thewiring indicated by the sign 10 b and having a square planar shape. Thecolumnar electrode 13 b is made of copper and has a square planar shape.Columnar electrodes (second columnar electrodes) 13 c are provided onthe upper surface of the connection pad portions 10 c-2 of the wiringsindicated by the sign 10 c. The columnar electrodes 13 c are made ofcopper and have a circular planar shape. Here, as shown in FIG. 1, eightcolumnar electrodes 13 c having a circular planar shape are arranged inmatrix form.

A sealing film 14 made of, for example, an epoxy resin is providedaround the columnar electrodes 13 a, 13 b, 13 c on the upper surface ofthe protective film 8 including the wirings 10 a, 10 b, 10 c. Thecolumnar electrodes 13 a, 13 b, 13 c are provided so that the uppersurfaces thereof are flush with or several μm lower than the uppersurface of the sealing film 14. The explanation of the structure of thesemiconductor construct 2 is completed now.

An insulating layer 21 in a square frame shape is provided on the uppersurface of the base plate 1 around the semiconductor construct 2. Forexample, the insulating layer 21 is made of a thermosetting resin suchas an epoxy resin in which a reinforcer of an inorganic material such assilica fuller is dispersed. Alternatively, the insulating layer 21 isonly made of a thermosetting resin such as an epoxy resin.

An upper insulating film 22 is provided on the upper surfaces of thesemiconductor construct 2 and the insulating layer 21. The upperinsulating film 22 is made of, for example, a base glass fabricimpregnated with a thermosetting resin such as an epoxy resin.Alternatively, the upper insulating film 22 is only made of athermosetting resin such as an epoxy resin. Openings (first openings) 23a, 23 b having a circular planar shape are provided in parts of theupper insulating film 22 that correspond to predetermined nine points onthe surface of the columnar electrodes 13 a, 13 b of the semiconductorconstruct 2 having a square planar shape. Openings (second openings) 23c having a circular planar shape are provided in parts of the upperinsulating film 22 that correspond to the centers of the upper surfacesof the columnar electrodes 13 c of the semiconductor construct 2 havinga circular planar shape.

In this case, the planar shape of the openings 23 a, 23 b is the same asthe planar shape of the opening 23 c. Moreover, both the number of theopenings 23 a and the number of the openings 23 b are nine, and aregreater than the number (four) of the power supply voltage and groundvoltage connection pads 5 a, 5 b of the semiconductor construct 2.

Upper wirings 24 a, 24 b, 24 c are provided on the upper surface of theupper insulating film 22. The upper wirings 24 a, 24 b, 24 c have adouble-layer structure composed of foundation metal layers 25 a, 25 b,25 c and upper metal layers 26 a, 26 b, 26 c. The foundation metallayers 25 a, 25 b, 25 c are made of, for example, copper and provided onthe upper surface of the upper insulating film 22. The upper metallayers 26 a, 26 b, 26 c are made of copper and provided on the uppersurfaces of the foundation metal layers 25 a, 25 b, 25 c.

In this case, as shown in FIG. 1, the upper wiring indicated by the sign24 a (common upper wiring, first upper wiring) is solidly disposed onthe upper left part of the upper insulating film 22 in a region of theupper insulating film 22 including nine openings 23 a. The upper wiring24 a is connected, via all of the nine openings 23 a of the upperinsulating film 22, to the predetermined nine points on the surface ofthe columnar electrode 13 a of the semiconductor construct 2 having asquare planar shape.

The upper wiring indicated by the sign 24 b (common upper wiring, firstupper wiring) is solidly disposed on the lower left part of the upperinsulating film 22 in a region of the upper insulating film 22 includingnine openings 23 b. The upper wiring 24 b is connected, via all of thenine openings 23 b of the upper insulating film 22, to the predeterminednine points on the surface of the ground voltage columnar electrode 13 bof the semiconductor construct 2 having a square planar shape.

Similarly to the wiring of the semiconductor construct 2 indicated bythe sign 10 c, each upper wiring indicated by the sign 24 c (secondupper wiring) has a connection portion, a connection pad portion, and anextension line extending therebetween. The upper wiring 24 c isconnected, via the opening 23 c of the upper insulating film 22, to thecenter of the upper surface of the columnar electrode 13 c of thesemiconductor construct 2 having a circular planar shape.

An overcoat film 27 made of, for example, a solder resist is provided onthe upper surface of the upper insulating film 22 including the upperwirings 24 a, 24 b, 24 c. Openings 28 a, 28 b are provided in parts ofthe overcoat film 27 that correspond to predetermined four points in theperipheral portions of the upper wirings 24 a, 24 b. An opening 28 c isprovided in a part of the overcoat film 27 that corresponds to theconnection pad portion of the upper wiring 24 c.

Solder balls 29 a, 29 b, 29 c are provided in and above the openings 28a, 28 b, 28 c of the overcoat film 27 so that these solder balls areconnected to the upper wirings 24 a, 24 b, 24 c. In this case, as shownin FIG. 1, the solder balls 29 a, 29 b, 29 c are only disposed aroundthe semiconductor construct 2. Moreover, both the number of the solderballs 29 a and the number of the solder balls 29 b are four, and are thesame as the number (four) of the power supply voltage and ground voltageconnection pads 5 a, 5 b of the semiconductor construct 2.

As described above, in this semiconductor device, the power supplyvoltage wiring 10 a and the ground voltage wiring 10 b of thesemiconductor construct 2 are solidly formed in a square planar shape,and each connected to all of the four connection pads 5 a, 5 b. Thisallows the power supply voltage wiring 10 a and the ground voltagewiring 10 b not to be burned off even if an excessively high currentruns through these wirings.

Furthermore, since the power supply voltage columnar electrode 13 a andthe ground voltage columnar electrode 13 b of the semiconductorconstruct 2 are solidly formed, the columnar electrodes 13 a, 13 b canbe reduced in resistance, and current capacity can thus be improved.Moreover, since the power supply voltage upper wiring 24 a and theground voltage upper wiring 24 b are solidly formed, the upper wirings24 a, 24 b can be reduced in resistance, and current capacity can thusbe improved.

Still further, since the number (nine) of the openings 23 a, 23 bprovided in the upper insulating film 22 on the power supply voltage andground voltage columnar electrodes 13 a, 13 b of the semiconductorconstruct 2 is greater than the number (four) of the power supplyvoltage and ground voltage connection pads 5 a, 5 b, the connectionportions of the openings 23 a, 23 b can be reduced in resistance as awhole, and current capacity can thus be further improved.

Here, the sizes of the parts of this semiconductor device are mentioned.The size of the base plate 1 is 3×3 mm. The size of the semiconductorconstruct 2 is 2×2 mm. The line width of the extension line 10 c-3 ofthe wiring 10 c of the semiconductor construct 2 is 20%. The diameter ofthe columnar electrode 13 c of the semiconductor construct 2 having acircular planar shape is 0.2 mm. The pitch of the columnar electrodes 13c is 0.4 mm. The diameter of the opening 23 a, 23 b, 23 c of the upperinsulating film 22 is 100%. The diameter of the solder balls 29 a, 29 b,29 c is 0.3 mm. The pitch of the solder balls 29 a, 29 b, 29 c is 0.65mm.

Now, one example of a method of manufacturing this semiconductor deviceis described. First, one example of a method of manufacturing thesemiconductor construct 2 is described. In this case, the ground voltageconnection pad 5 b and associated parts are substantially similar to thepower supply voltage connection pads 5 a and associated parts, and aretherefore not described.

First, as shown in FIG. 3, an assembly is prepared. In this assembly,connection pads 5 a, 5 c, a passivation film 6 and a protective film 8are formed on the upper surface of a silicon substrate in a wafer state(hereinafter referred to as a semiconductor wafer 31). Further, thecenters of the connection pads 5 a, 5 c are exposed through openings 7a, 7 c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8.

In this case, the thickness of the semiconductor wafer 31 is greaterthan the thickness of a silicon substrate 4 shown in FIG. 2. In FIG. 3,zones indicated by the sign 32 are dicing streets. The parts of thepassivation film 6 and the protective film 8 corresponding to the dicingstreet 32 and both its sides are removed.

Then, as shown in FIG. 4, a foundation metal layer 33 is formed on theentire upper surface of the protective film 8 including the uppersurfaces of the connection pads 5 a, 5 c exposed through openings 7 a, 7c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8. In this case, the foundation metal layer 33 may onlybe a copper layer formed by electroless plating, may only be a copperlayer formed by sputtering, or may be a copper layer formed bysputtering on a thin film layer of, for example, titanium formed bysputtering.

Then, a plating resist film 34 made of a positive liquid resist ispatterned and formed on the upper surface of the foundation metal layer33. In this case, openings 35 a, 35 c are formed in parts of the platingresist film 34 corresponding to regions where upper metal layers 12 a,12 c are to be formed. Further, electrolytic plating with copper iscarried out using the foundation metal layer 33 as a plating currentpath, thereby forming the upper metal layers 12 a, 12 c on the uppersurface of the foundation metal layer 33 within the openings 35 a, 35 cin the plating resist film 34. Subsequently, the plating resist film 34is released.

Then, as shown in FIG. 5, a plating resist film 36 made of a negativedry film resist is patterned and formed on the upper surface of thefoundation metal layer 33. In this case, openings 37 a, 37 c are formedin parts of the plating resist film 36 corresponding to parts of theupper metal layer 12 a except for its peripheral portion (a region wherea columnar electrode 13 a is to be formed) and corresponding to theconnection pad portion of the upper metal layer 12 c (a region where acolumnar electrode 13 c is to be formed).

Then, electrolytic plating with copper is carried out using thefoundation metal layer 33 as a plating current path. As a result, thecolumnar electrode 13 a is formed on the upper surface of the uppermetal layer 12 a within the openings 37 a in the plating resist film 36.Moreover, the columnar electrode 13 c is formed on the upper surface ofthe connection pad portion of the upper metal layer 12 c within theopenings 37 c in the plating resist film 36. Subsequently, the platingresist film 36 is released.

Then, using the upper metal layers 12 a, 12 c as masks, the foundationmetal layer 33 located in parts other than parts under the upper metallayers 12 a, 12 c is etched and removed. Thus, as shown in FIG. 6,foundation metal layers 11 a, 11 c remain under the upper metal layers12 a, 12 c alone. In this state, wirings 10 a, 10 c having adouble-layer structure are formed by the upper metal layers 12 a, 12 cand the foundation metal layers 11 a, 11 c remaining thereunder.

Then, as shown in FIG. 7, a sealing film 14 made of, for example, anepoxy resin is formed by, for example, a spin coat method on the uppersurface of the semiconductor wafer 31 corresponding to the dicing street32 and both its sides and on the upper surface of the protective film 8including the wirings 10 a, 10 c and the columnar electrodes 13 a, 13 cso that the thickness of this sealing film 14 is slightly greater thanthe height of the columnar electrodes 13 a, 13 c. Thus, in this state,the upper surfaces of the columnar electrodes 13 a, 13 c are coveredwith the sealing film 14.

Then, the upper side of the sealing film 14 is properly ground to exposethe upper surfaces of the columnar electrodes 13 a, 13 c as shown inFIG. 8, and the upper surface of the sealing film 14 including theexposed upper surfaces of the columnar electrodes 13 a, 13 c isplanarized. Further, as shown in FIG. 9, the lower side of thesemiconductor wafer 31 is properly ground to reduce the thickness of thesemiconductor wafer 31.

Then, as shown in FIG. 10, a bonding layer 3 is bonded to the lowersurface of the semiconductor wafer 31. The bonding layer 3 is made of adie bond material such as an epoxy resin, and is fixedly attached in asemi-cured state by heating and pressurization to the lower surface ofthe semiconductor wafer 31. Further, as shown in FIG. 11, the sealingfilm 14, the semiconductor wafer 31 and the bonding layer 3 are cutalong the dicing streets 32, thereby obtaining semiconductor constructs2 having the bonding layers 3 on the lower surface.

Now, one example of how to manufacture the semiconductor device shown inFIG. 2 using the semiconductor construct 2 shown in FIG. 11 isdescribed. In this case as well, parts associated with the groundvoltage connection pad 5 b are substantially similar to parts associatedwith the power supply voltage connection pads 5 a, and are therefore notdescribed.

First, as shown in FIG. 12, a base plate 1 is prepared. This base plate1 is made of, for example, an epoxy resin containing glass fabric as abase material, and has an area that allows the completed semiconductordevices shown in FIG. 2 to be formed thereon. For example, the baseplate 1 has, but not exclusively, a square planar shape. In addition,zones indicated by the sign 41 in FIG. 12 correspond to cut lines fordivision.

Then, the bonding layers 3 fixedly attached to the lower surfaces of thesilicon substrates 4 of the semiconductor constructs 2 are bonded tosemiconductor construct placement regions on the upper surface of thebase plate 1 to leave space in between. In this bonding, the bondinglayers 3 are fully cured by heating and pressurization.

Then, as shown in FIG. 13, a lattice-shaped insulating layer formationsheet 21 a is positioned by, for example, pins and thus disposed on theupper surface of the base plate 1 around the semiconductor construct 2.The lattice-shaped insulating layer formation sheet 21 a is prepared bydispersing a reinforcer in a thermosetting resin such as an epoxy resin,semi-curing the thermosetting resin into a sheet form, and formingsquare holes in the sheet by, for example, punching.

Then, an upper insulating film formation sheet 22 a is disposed on theupper surfaces of the semiconductor construct 2 and the insulating layerformation sheet 21 a. The upper insulating film formation sheet 22 a isprepared by impregnating, for example, glass fabric with a thermosettingresin such as an epoxy resin, and semi-curing the thermosetting resininto a sheet form.

Then, the insulating layer formation sheet 21 a and the upper insulatingfilm formation sheet 22 a are heated and pressurized from the top andbottom using a pair of heating/pressurization plates 42, 43. Bysubsequent cooling, an insulating layer 21 in a square frame shape isformed on the upper surface of the base plate 1 around the semiconductorconstruct 2, and an upper insulating film 22 is formed on the uppersurfaces of the semiconductor construct 2 and the insulating layer 21.In this case, the upper surface of the upper insulating film 22 ispressed by the lower surface of the upper heating/pressurization plate42, and is therefore a flat surface.

Then, as shown in FIG. 14, by laser processing to radiate a laser beam,openings 23 a are formed in parts of the upper insulating film 22 thatcorrespond to predetermined nine points on the upper surface of thecolumnar electrode 13 a of the semiconductor construct 2. Also, anopening 23 c is formed in a part of the upper insulating film 22 thatcorresponds to the center of the upper surface of the columnar electrode13 c of the semiconductor construct 2.

Then, as shown in FIG. 15, a foundation metal layer 44 is formed on theentire upper surface of the upper insulating film 22 including the uppersurfaces of the columnar electrodes 13 a, 13 c of the semiconductorconstruct 2 that are exposed through the openings 23 a, 23 c of theupper insulating film 22. In this case as well, the foundation metallayer 44 may only be a copper layer formed by electroless plating, mayonly be a copper layer formed by sputtering, or may be a copper layerformed by sputtering on a thin film layer of, for example, titaniumformed by sputtering.

Then, a plating resist film 45 is patterned and formed on the uppersurface of the foundation metal layer 44. In this case, openings 46 a,46 c are formed in parts of the plating resist film 45 corresponding toregions where upper metal layers 26 a, 26 c are to be formed. Further,electrolytic plating with copper is carried out using the foundationmetal layer 44 as a plating current path, thereby forming the uppermetal layers 26 a, 26 c on the upper surface of the foundation metallayer 44 within the openings 46 a, 46 c in the plating resist film 45.

Then, the plating resist film 45 is released. Further, using the uppermetal layers 26 a, 26 c as masks, the foundation metal layer 44 locatedin parts other than parts under the upper metal layers 26 a, 26 c isetched and removed. Thus, as shown in FIG. 16, foundation metal layers25 a, 25 c remain under the upper metal layers 26 a, 26 c alone. In thisstate, upper wirings 24 a, 24 b are formed by the upper metal layers 26a, 26 c and the foundation metal layers 25 a, 25 c remaining thereunder.

Then, as shown in FIG. 17, an overcoat film 27 made of, for example, asolder resist is formed by, for example, a screen printing method orspin coat method on the upper surface of the upper insulating film 22including the upper wirings 24 a, 24 c. In this case, openings 28 a, 28b are formed in parts of the overcoat film 27 that correspond topredetermined four points of the upper surface of the upper wiring 24 aand to the connection pad portion of the upper wiring 24 c.

Then, solder balls 29 a, 29 c are formed in and above the openings 28 a,28 c of the overcoat film 27 so that these solder balls are connected tothe predetermined four points of the upper surface of the upper wiring24 a and to the connection pad portion of the upper wiring 24 c.Further, as shown in FIG. 18, the overcoat film 27, the upper insulatingfilm 22, the insulating layer 21 and the base plate 1 are cut along thecut lines 41 between adjacent semiconductor constructs 2, therebyobtaining semiconductor devices shown in FIG. 2.

Second Embodiment

FIG. 19 shows a transmitted plan view of a semiconductor deviceaccording to a second embodiment of the invention. FIG. 20 shows asectional view of a proper part of the semiconductor device shown inFIG. 19. This semiconductor device includes a base plate 1. The baseplate 1 has a square planar shape, and made of, for example, an epoxyresin containing glass fabric as a base material. The lower surface of asemiconductor construct 2 is bonded to the center of the upper surfaceof the base plate 1 through a bonding layer 3 made of a die bondmaterial. The semiconductor construct 2 has a square planar shape, andis slightly smaller in size than the base plate 1.

The semiconductor construct 2, which is generally called a CSP, includesa silicon substrate (semiconductor substrate) 4. The lower surface ofthe silicon substrate 4 is bonded to the center of the upper surface ofthe base plate 1 through the bonding layer 3. Elements (not shown) suchas a transistor, diode, resistor, and condenser that constitute anintegrated circuit having a predetermined function are formed on theupper surface of the silicon substrate 4. Connection pads 5 a, 5 b, 5 care provided on the peripheral portion of the upper surface of thesilicon substrate 4. The connection pads 5 a, 5 b, 5 c are made of, forexample, an aluminum-based metal, and connected to the elements of theintegrated circuit.

Here, by way of example, the four connection pads indicated by the sign5 a and arranged on the upper left part of the silicon substrate 4 inFIG. 19 are for a common power supply voltage. The four connection padsindicated by the sign 5 b and arranged on the lower left part of thesilicon substrate 4 are for a common ground voltage. The four connectionpads indicated by the sign 5 c and arranged on the upper right part ofthe silicon substrate 4 and the four connection pads indicated by thesign 5 c and arranged on the lower right part of the silicon substrate 4are for a normal voltage. Here, in FIG. 20, the ground voltageconnection pads 5 b and associated parts are substantially similar tothe power supply voltage connection pads 5 a and associated parts, andare therefore indicated by signs in parentheses.

A passivation film (insulating film) 6 made of, for example, siliconoxide is provided on the upper surface of the silicon substrate 4 exceptfor the peripheral portion of the silicon substrate 4 and the centers ofthe connection pads 5 a, 5 b, 5 c. The centers of the connection pads 5a, 5 b, 5 c are exposed through openings 7 a, 7 b, 7 c provided in thepassivation film 6. A protective film (insulating film) 8 made of, forexample, a polyimide resin is provided on the upper surface of thepassivation film 6. Openings 9 a, 9 b, 9 c are provided in parts of theprotective film 8 that correspond to the openings 7 a, 7 b, 7 c of thepassivation film 6.

Wirings 10 a, 10 b, 10 c are provided on the upper surface of theprotective film 8. The wirings 10 a, 10 b, 10 c have a double-layerstructure composed of foundation metal layers 11 a, 11 b, 11 c and uppermetal layers 12 a, 12 b, 12 c. The foundation metal layers 11 a, 11 b,11 c are made of, for example, copper and provided on the upper surfaceof the protective film 8. The upper metal layers 12 a, 12 b, 12 c aremade of copper and provided on the upper surfaces of the foundationmetal layers 11.

In this case, as shown in FIG. 19, the wiring indicated by the sign 10 a(common wiring) is solidly disposed on the upper left part of thesilicon substrate 4 in a region that has a square planar shape andincludes the four power supply voltage connection pads 5 a. The wiring10 a is connected to all of the four power supply voltage connectionpads 5 a via the openings 7 a, 9 a of the passivation film 6 and theprotective film 8.

The wiring indicated by the sign 10 b (common wiring) is solidlydisposed on the lower left part of the silicon substrate 4 in a regionthat has a square planar shape and includes the four ground voltageconnection pads 5 b. The wiring 10 b is connected to all of the fourground voltage connection pads 5 b via the openings 7 b, 9 b of thepassivation film 6 and the protective film 8.

The wirings indicated by the sign 10 c are disposed in the right regionof the silicon substrate 4. Each wiring 10 c has a connection portion 10c-1 connected to the normal voltage connection pad 5 c via the openings7 c, 9 c of the passivation film 6 and the protective film 8, aconnection pad portion 10 c-2 having a circular planar shape, and anextension line 10 c-3 extending between the connection portion 10 c-1and the connection pad portion 10 c-2.

Columnar electrodes (common columnar electrodes, first columnarelectrodes) 13 a are provided at predetermined four points on the uppersurface of the wiring indicated by the sign 10 a and having a squareplanar shape. The columnar electrodes 13 a are made of copper and have acircular planar shape. Columnar electrodes (common columnar electrodes,first columnar electrodes) 13 b are provided at predetermined fourpoints on the upper surface of the wiring indicated by the sign 10 b andhaving a square planar shape. The columnar electrodes 13 b are made ofcopper and have a circular planar shape. Columnar electrodes (secondcolumnar electrodes) 13 c are provided on the upper surface of theconnection pad portions 10 c-2 of the wirings indicated by the sign 10c. The columnar electrodes 13 c are made of copper and have a circularplanar shape.

Here, the number of the columnar electrodes 13 a and the number of thecolumnar electrodes 13 b are the same as the number of the power supplyvoltage connection pads 5 a and the number of the ground voltageconnection pads 5 b, respectively. Moreover, the columnar electrodes 13a, 13 b have the same shape as the columnar electrodes 13 c. Inaddition, as shown in FIG. 19, a total of 16 columnar electrodes 13 a,13 b, 13 c are arranged in matrix form.

A sealing film 14 made of, for example, an epoxy resin is providedaround the columnar electrodes 13 a, 13 b, 13 c on the upper surface ofthe protective film 8 including the wirings 10 a, 10 b, 10 c. Thecolumnar electrodes 13 a, 13 b, 13 c are provided so that the uppersurfaces thereof are flush with or several μm lower than the uppersurface of the sealing film 14. The explanation of the structure of thesemiconductor construct 2 is completed now.

An insulating layer 21 in a square frame shape is provided on the uppersurface of the base plate 1 around the semiconductor construct 2. Forexample, the insulating layer 21 is made of a thermosetting resin suchas an epoxy resin in which a reinforcer of an inorganic material such assilica fuller is dispersed. Alternatively, the insulating layer 21 isonly made of a thermosetting resin such as an epoxy resin.

An upper insulating film 22 is provided on the upper surfaces of thesemiconductor construct 2 and the insulating layer 21. The upperinsulating film 22 is made of, for example, a base glass fabricimpregnated with a thermosetting resin such as an epoxy resin.Alternatively, the upper insulating film 22 is only made of athermosetting resin such as an epoxy resin.

Openings (first openings) 23 a, 23 b having a square planar shape areprovided in parts of the upper insulating film 22 that correspond toregions that have a square planar shape and include four columnarelectrodes 13 a, 13 b of the semiconductor construct 2. An opening(second opening) 23 c having a circular planar shape is provided in apart of the upper insulating film 22 that corresponds to the center ofthe upper surface of the columnar electrode 13 c of the semiconductorconstruct 2.

Upper wirings 24 a, 24 b, 24 c are provided on the upper surface of theupper insulating film 22. The upper wirings 24 a, 24 b, 24 c have adouble-layer structure composed of foundation metal layers 25 a, 25 b,25 c and upper metal layers 26 a, 26 b, 26 c. The foundation metallayers 25 a, 25 b, 25 c are made of, for example, copper and provided onthe upper surface of the upper insulating film 22. The upper metallayers 26 a, 26 b, 26 c are made of copper and provided on the uppersurfaces of the foundation metal layers 25 a, 25 b, 25 c.

In this case, as shown in FIG. 19, the upper wiring indicated by thesign 24 a (common upper wiring, first upper wiring) is solidly disposedon the upper left part of the upper insulating film 22 in a region ofthe upper insulating film 22 including an opening 23 a having a squareplanar shape. The upper wiring 24 a is connected, via one opening 23 aof the upper insulating film 22 having a square planar shape, to theupper surfaces of all the four power supply voltage columnar electrodes13 a of the semiconductor construct 2. Here, within the opening 23 a ofthe upper insulating film 22, the upper wiring 24 a is provided on theupper surfaces of the four columnar electrodes 13 a of the semiconductorconstruct 2 and on the upper surface of the sealing film 14 therearound.

The upper wiring indicated by the sign 24 b (common upper wiring, firstupper wiring) is solidly disposed on the lower left part of the upperinsulating film 22 in a region of the upper insulating film 22 includingthe opening 23 b having a square planar shape. The upper wiring 24 b isconnected, via one opening 23 b of the upper insulating film 22 having asquare planar shape, to the upper surfaces of all the four groundvoltage columnar electrodes 13 b of the semiconductor construct 2. Inthis case as well, within the opening 23 b of the upper insulating film22, the upper wiring 24 b is provided on the upper surfaces of the fourcolumnar electrodes 13 b of the semiconductor construct 2 and on theupper surface of the sealing film 14 therearound.

Similarly to the wiring of the semiconductor construct 2 indicated bythe sign 10 c, each upper wiring indicated by the sign 24 c (secondupper wiring) has a connection portion, a connection pad portion, and anextension line extending therebetween. The upper wiring 24 c isconnected to the center of the upper surface of the columnar electrode13 c of the semiconductor construct 2 via the opening 23 c of the upperinsulating film 22 having a circular planar shape. Here, as shown inFIG. 20, the upper surfaces of the upper wirings 24 a, 24 b, 24 c areflush.

An overcoat film 27 made of, for example, a solder resist is provided onthe upper surface of the upper insulating film 22 including the upperwirings 24 a, 24 b, 24 c. Openings 28 a, 28 b are provided in parts ofthe overcoat film 27 that correspond to predetermined four points of theperipheral portion of the upper wirings 24 a, 24 b. An opening 28 c isprovided in a part of the overcoat film 27 that corresponds to theconnection pad portion of the upper wiring 24 c.

Solder balls 29 a, 29 b, 29 c are provided in and above the openings 28a, 28 b, 28 c of the overcoat film 27 so that these solder balls areconnected to the upper wirings 24 a, 24 b, 24 c. In this case, as shownin FIG. 19, the solder balls 29 a, 29 b, 29 c are only disposed aroundthe semiconductor construct 2. Moreover, both the number of the solderballs 29 a and the number of the solder balls 29 b are four, and are thesame as the number (four) of the power supply voltage and ground voltageconnection pads 5 a, 5 b of the semiconductor construct 2.

As described above, in this semiconductor device, the power supplyvoltage wiring 10 a and the ground voltage wiring 10 b of thesemiconductor construct 2 are solidly formed in a square planar shape,and each connected to all of the four connection pads 5 a, 5 b. Thisallows the power supply voltage wiring 10 a and the ground voltagewiring 10 b not to be burned off even if an excessively high currentruns through these wirings.

Furthermore, since one opening 23 a, 23 b having a square planar shapeis provided in each of the parts of the upper insulating film 22 thatcorrespond to the four power supply voltage columnar electrodes 13 a andthe four ground voltage columnar electrodes 13 b of the semiconductorconstruct 2. The solidly-formed upper wirings 24 a, 24 b are provided onthe upper insulating film 22 so that these upper wirings are connectedto all the four columnar electrodes 13 a and all the four columnarelectrodes 13 b of the semiconductor construct 2 via the opening 23 a,23 b of the upper insulating film 22, the parts corresponding to theopening 23 a, 23 b of the upper insulating film 22 can be reduced inresistance, and current capacity can thus be improved.

Here, the sizes of the parts of this semiconductor device are mentioned.The size of the base plate 1 is 3×3 mm. The size of the semiconductorconstruct 2 is 2×2 mm. The line width of the extension line 10 c-3 ofthe wiring 10 c of the semiconductor construct 2 is 20 μm. The diameterof the columnar electrode 13 a, 13 b, 13 c of the semiconductorconstruct 2 is 0.2 mm. The pitch of the columnar electrode 13 a, 13 b,13 c is 0.4 mm. The diameter of the opening 23 c of the upper insulatingfilm 22 having a circular planar shape is 100 μm. The diameter of thesolder balls 29 a, 29 b, 29 c is 0.3 mm. The pitch of the solder balls29 a, 29 b, 29 c is 0.65 mm.

Now, one example of a method of manufacturing this semiconductor deviceis described. First, one example of a method of manufacturing thesemiconductor construct 2 is described. In this case, the ground voltageconnection pad 5 b and associated parts are substantially similar to thepower supply voltage connection pads 5 a and associated parts, and aretherefore not described.

First, as shown in FIG. 21, an assembly is prepared. In this assembly,connection pads 5 a, 5 c, a passivation film 6 and a protective film 8are formed on the upper surface of a silicon substrate in a wafer state(hereinafter referred to as a semiconductor wafer 31). Further, thecenters of the connection pads 5 a, 5 c are exposed through openings 7a, 7 c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8.

In this case, the thickness of the semiconductor wafer 31 is greaterthan the thickness of a silicon substrate 4 shown in FIG. 20. In FIG.21, zones indicated by the sign 32 are dicing streets. The parts of thepassivation film 6 and the protective film 8 corresponding to the dicingstreet 32 and both its sides are removed.

Then, as shown in FIG. 22, a foundation metal layer 33 is formed on theentire upper surface of the protective film 8 including the uppersurfaces of the connection pads 5 a, 5 c exposed through openings 7 a, 7c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8. In this case, the foundation metal layer 33 may onlybe a copper layer formed by electroless plating, may only be a copperlayer formed by sputtering, or may be a copper layer formed bysputtering on a thin film layer of, for example, titanium formed bysputtering.

Then, a plating resist film 34 made of a positive liquid resist ispatterned and formed on the upper surface of the foundation metal layer33. In this case, openings 35 a, 35 c are formed in parts of the platingresist film 34 corresponding to regions where upper metal layers 12 a,12 c are to be formed. Further, electrolytic plating with copper iscarried out using the foundation metal layer 33 as a plating currentpath, thereby forming the upper metal layers 12 a, 12 c on the uppersurface of the foundation metal layer 33 within the openings 35 a, 35 cin the plating resist film 34. Subsequently, the plating resist film 34is released.

Then, as shown in FIG. 23, a plating resist film 36 made of a negativedry film resist is patterned and formed on the upper surface of thefoundation metal layer 33. In this case, openings 37 a, 37 c are formedin parts of the plating resist film 36 corresponding to predeterminedfour points of the upper metal layer 12 a (a region where a columnarelectrode 13 a is to be formed) and corresponding to the connection padportion of the upper metal layer 12 c (a region where a columnarelectrode 13 c is to be formed).

Then, electrolytic plating with copper is carried out using thefoundation metal layer 33 as a plating current path. As a result, thecolumnar electrode 13 a is formed on the upper surface of the uppermetal layer 12 a within the openings 37 a in the plating resist film 36.Moreover, the columnar electrode 13 c is formed on the upper surface ofthe connection pad portion of the upper metal layer 12 c within theopenings 37 c in the plating resist film 36. Subsequently, the platingresist film 36 is released.

Then, using the upper metal layers 12 a, 12 c as masks, the foundationmetal layer 33 located in parts other than parts under the upper metallayers 12 a, 12 c is etched and removed. Thus, as shown in FIG. 24,foundation metal layers 11 a, 11 c remain under the upper metal layers12 a, 12 c alone. In this state, wirings 10 a, 10 c having adouble-layer structure are formed by the upper metal layers 12 a, 12 cand the foundation metal layers 11 a, 11 c remaining thereunder.

Then, as shown in FIG. 25, a sealing film 14 made of, for example, anepoxy resin is formed by, for example, the spin coat method on the uppersurface of the semiconductor wafer 31 corresponding to the dicing street32 and both its sides and on the upper surface of the protective film 8including the wirings 10 a, 10 c and the columnar electrodes 13 a, 13 cso that the thickness of this sealing film 14 is slightly greater thanthe height of the columnar electrodes 13 a, 13 c. Thus, in this state,the upper surfaces of the columnar electrodes 13 a, 13 c are coveredwith the sealing film 14.

Then, the upper side of the sealing film 14 is properly ground to exposethe upper surfaces of the columnar electrodes 13 a, 13 c as shown inFIG. 26, and the upper surface of the sealing film 14 including theexposed upper surfaces of the columnar electrodes 13 a, 13 c isplanarized. Further, as shown in FIG. 27, the lower side of thesemiconductor wafer 31 is properly ground to reduce the thickness of thesemiconductor wafer 31.

Then, as shown in FIG. 28, a bonding layer 3 is bonded to the lowersurface of the semiconductor wafer 31. The bonding layer 3 is made of adie bond material such as an epoxy resin, and is fixedly attached in asemi-cured state by heating and pressurization to the lower surface ofthe semiconductor wafer 31. Further, as shown in FIG. 29, the sealingfilm 14, the semiconductor wafer 31 and the bonding layer 3 are cutalong the dicing streets 32, thereby obtaining semiconductor constructs2 having the bonding layers 3 on the lower surface.

Now, one example of how to manufacture the semiconductor device shown inFIG. 20 using the semiconductor construct 2 shown in FIG. 29 isdescribed. In this case as well, parts associated with the groundvoltage connection pad 5 b are substantially similar to parts associatedwith the power supply voltage connection pads 5 a, and are therefore notdescribed.

First, as shown in FIG. 30, a base plate 1 is prepared. This base plate1 is made of, for example, an epoxy resin containing glass fabric as abase material, and has an area that allows the completed semiconductordevices shown in FIG. 20 to be formed thereon. For example, the baseplate 1 has, but not exclusively, a square planar shape. In addition,zones indicated by the sign 41 in FIG. 30 correspond to cut lines fordivision.

Then, the bonding layers 3 fixedly attached to the lower surfaces of thesilicon substrates 4 of the semiconductor constructs 2 are bonded tosemiconductor construct placement regions on the upper surface of thebase plate 1 to leave space in between. In this bonding, the bondinglayers 3 are fully cured by heating and pressurization.

Then, as shown in FIG. 31, a lattice-shaped insulating layer formationsheet 21 a is positioned by, for example, pins and thus disposed on theupper surface of the base plate 1 around the semiconductor construct 2.The lattice-shaped insulating layer formation sheet 21 a is prepared bydispersing a reinforcer in a thermosetting resin such as an epoxy resin,semi-curing the thermosetting resin into a sheet form, and formingsquare holes in the sheet by, for example, punching.

Then, an upper insulating film formation sheet 22 a is disposed on theupper surfaces of the semiconductor construct 2 and the insulating layerformation sheet 21 a. The upper insulating film formation sheet 22 a isprepared by impregnating, for example, glass fabric with a thermosettingresin such as an epoxy resin, and semi-curing the thermosetting resininto a sheet form.

Then, the insulating layer formation sheet 21 a and the upper insulatingfilm formation sheet 22 a are heated and pressurized from the top andbottom using a pair of heating/pressurization plates 42, 43. Bysubsequent cooling, an insulating layer 21 in a square frame shape isformed on the upper surface of the base plate 1 around the semiconductorconstruct 2, and an upper insulating film 22 is formed on the uppersurfaces of the semiconductor construct 2 and the insulating layer 21.In this case, the upper surface of the upper insulating film 22 ispressed by the lower surface of the upper heating/pressurization plate42, and is therefore a flat surface.

Then, as shown in FIG. 32, by laser processing to radiate a laser beam,an opening 23 a having a square planar shape is formed in a part of theupper insulating film 22 that corresponds to a region of thesemiconductor construct 2 having a square planar shape and including thefour columnar electrodes 13 a. Also, an opening 23 c having a circularplanar shape is formed in a part of the upper insulating film 22 thatcorresponds to the center of the upper surface of the columnar electrode13 c of the semiconductor construct 2.

In this state, the upper surface of the sealing film 14 around thecolumnar electrodes 13 a is exposed through the opening 23 a having asquare planar shape.

Then, as shown in FIG. 33, a foundation metal layer 44 is formed on theentire upper surface of the upper insulating film 22 including the uppersurfaces of the columnar electrodes 13 a and the sealing film 14 of thesemiconductor construct 2 that are exposed through the opening 23 a ofthe upper insulating film 22 and including the upper surface of thecolumnar electrode 13 c of the semiconductor construct 2 exposed throughthe opening 23 c of the upper insulating film 22. In this case as well,the foundation metal layer 44 may only be a copper layer formed byelectroless plating, may only be a copper layer formed by sputtering, ormay be a copper layer formed by sputtering on a thin film layer of, forexample, titanium formed by sputtering.

Then, a plating resist film 45 is patterned and formed on the uppersurface of the foundation metal layer 44. In this case, openings 46 a,46 c are formed in parts of the plating resist film 45 corresponding toregions where upper metal layers 26 a, 26 c are to be formed. Further,electrolytic plating with copper is carried out using the foundationmetal layer 44 as a plating current path, thereby forming the uppermetal layers 26 a, 26 c on the upper surface of the foundation metallayer 44 within the openings 46 a, 46 c in the plating resist film 45.

In this case, since the copper plating is isotropically formed on theupper surface of the foundation metal layer 44, the thinnest portion ofthe upper metal layer 26 a formed on the upper surface of the foundationmetal layer 44 within the opening 23 a of the upper insulating film 22is set at a thickness equal to or greater than the thickness of theupper metal layer 26 a shown in FIG. 20. Then, the plating resist film45 is released. Further, the upper side of the upper metal layers 26 a,26 c is properly ground so that the upper surfaces of the upper metallayers 26 a, 26 c may be flush, as shown in FIG. 34.

Then, using the upper metal layers 26 a, 26 c as masks, the foundationmetal layer 44 located in parts other than parts under the upper metallayers 26 a, 26 c is etched and removed. Thus, as shown in FIG. 35,foundation metal layers 25 a, 25 c remain under the upper metal layers26 a, 26 c alone. In this state, upper wirings 24 a, 24 c are formed bythe upper metal layers 26 a, 26 c and the foundation metal layers 25 a,25 c remaining thereunder.

Then, as shown in FIG. 36, an overcoat film 27 made of, for example, asolder resist is formed by, for example, the screen printing method orspin coat method on the upper surface of the upper insulating film 22including the upper wirings 24 a, 24 c. In this case, openings 28 a, 28b are formed in parts of the overcoat film 27 that correspond topredetermined four points of the upper surface of the upper wiring 24 aand to the connection pad portion of the upper wiring 24 c.

Then, solder balls 29 a, 29 c are formed in and above the openings 28 a,28 c of the overcoat film 27 so that these solder balls are connected tothe predetermined four points of the upper surface of the upper wiring24 a and to the connection pad portion of the upper wiring 24 c.Further, as shown in FIG. 37, the overcoat film 27, the upper insulatingfilm 22, the insulating layer 21 and the base plate 1 are cut along thecut lines 41 between adjacent semiconductor constructs 2, therebyobtaining semiconductor devices shown in FIG. 20.

Third Embodiment

FIG. 38 shows a transmitted plan view of a semiconductor deviceaccording to a third embodiment of the invention. FIG. 39 shows asectional view of a proper part of the semiconductor device shown inFIG. 38. This semiconductor device is different from the semiconductordevice shown in FIG. 19 and FIG. 20 in that, in a semiconductorconstruct 2, columnar electrodes 13 a, 13 b having a square planar shapeare solidly provided, in similar fashion to power supply voltage andground voltage wirings that are indicated by the signs 10 a, 10 b andhave a square planar shape, in regions of the upper surfaces of thewirings 10 a, 10 b except for the peripheral portions thereof.

In this case, openings 23 a, 23 b of an upper insulating film 22 areprovided in parts corresponding to the upper surfaces of the columnarelectrodes 13 a, 13 b except for the peripheral portions thereof.Further, upper wirings 24 a, 24 b are connected, via the openings 23 a,23 b of the upper insulating film 22, to the upper surfaces of thecolumnar electrodes 13 a, 13 b except for the peripheral portionsthereof.

As described above, since the power supply voltage columnar electrode 13a and the ground voltage columnar electrode 13 of the semiconductorconstruct 2 are solidly formed in this semiconductor device, thecolumnar electrodes 13 a, 13 b can be reduced in resistance, and currentcapacity can thus be further improved.

Fourth Embodiment

FIG. 40 shows a transmitted plan view of a semiconductor deviceaccording to a fourth embodiment of the invention. FIG. 41 is asectional view of a proper part of the semiconductor device shown inFIG. 41. This semiconductor device includes a base plate 1. The baseplate 1 has a square planar shape, and made of, for example, an epoxyresin containing glass fabric as a base material. The lower surface of asemiconductor construct 2 is bonded to the center of the upper surfaceof the base plate 1 through a bonding layer 3 made of a die bondmaterial. The semiconductor construct 2 has a square planar shape, andis slightly smaller in size than the base plate 1.

The semiconductor construct 2, which is generally called a CSP, includesa silicon substrate (semiconductor substrate) 4. The lower surface ofthe silicon substrate 4 is bonded to the center of the upper surface ofthe base plate 1 through the bonding layer 3. Elements (not shown) suchas a transistor, diode, resistor, and condenser that constitute anintegrated circuit having a predetermined function are formed on theupper surface of the silicon substrate 4. Connection pads 5 a, 5 b, 5 care provided on the peripheral portion of the upper surface of thesilicon substrate 4. The connection pads 5 a, 5 b, 5 c are made of, forexample, an aluminum-based metal, and connected to the elements of theintegrated circuit.

Here, by way of example, the four connection pads indicated by the sign5 a and arranged on the upper left part of the silicon substrate 4 inFIG. 40 are for a common power supply voltage. The four connection padsindicated by the sign 5 b and arranged on the lower left part of thesilicon substrate 4 are for a common ground voltage. The four connectionpads indicated by the sign 5 c and arranged on the upper right part ofthe silicon substrate 4 and the four connection pads indicated by thesign 5 c and arranged on the lower right part of the silicon substrate 4are for a normal voltage. Here, in FIG. 41, the ground voltageconnection pads 5 b and associated parts are substantially similar tothe power supply voltage connection pads 5 a and associated parts, andare therefore indicated by signs in parentheses.

A passivation film (insulating film) 6 made of, for example, siliconoxide is provided on the upper surface of the silicon substrate 4 exceptfor the peripheral portion of the silicon substrate 4 and the centers ofthe connection pads 5 a, 5 b, 5 c. The centers of the connection pads 5a, 5 b, 5 c are exposed through openings 7 a, 7 b, 7 c provided in thepassivation film 6. A protective film (insulating film) 8 made of, forexample, a polyimide resin is provided on the upper surface of thepassivation film 6. Openings 9 a, 9 b, 9 c are provided in parts of theprotective film 8 that correspond to the openings 7 a, 7 b, 7 c of thepassivation film 6.

Wirings 10 a, 10 b, 10 c are provided on the upper surface of theprotective film 8. The wirings 10 a, 10 b, 10 c have a double-layerstructure composed of foundation metal layers 11 a, 11 b, 11 c and uppermetal layers 12 a, 12 b, 12 c. The foundation metal layers 11 a, 11 b,11 c are made of, for example, copper and provided on the upper surfaceof the protective film 8. The upper metal layers 12 a, 12 b, 12 c aremade of copper and provided on the upper surfaces of the foundationmetal layers 11.

In this case, as shown in FIG. 40, the wiring indicated by the sign 10 a(common wiring) is solidly disposed on the upper left part of thesilicon substrate 4 in a region that has a square planar shape andincludes the four power supply voltage connection pads 5 a. The wiring10 a is connected to all of the four power supply voltage connectionpads 5 a via the openings 7 a, 9 a of the passivation film 6 and theprotective film 8.

The wiring indicated by the sign 10 b (common wiring) is solidlydisposed on the lower left part of the silicon substrate 4 in a regionthat has a square planar shape and includes the four ground voltageconnection pads 5 b. The wiring 10 b is connected to all of the fourground voltage connection pads 5 b via the openings 7 b, 9 b of thepassivation film 6 and the protective film 8.

The wirings indicated by the sign 10 c are disposed in the right regionof the silicon substrate 4. Each wiring 10 c has a connection portion 10c-1 connected to the normal voltage connection pad 5 c via the openings7 c, 9 c of the passivation film 6 and the protective film 8, aconnection pad portion 10 c-2 having a circular planar shape, and anextension line 10 c-3 extending between the connection portion 10 c-1and the connection pad portion 10 c-2.

Columnar electrodes (common columnar electrodes, first columnarelectrodes) 13 a made of copper are provided at predetermined fourpoints on the upper surface of the wiring indicated by the sign 10 a andhaving a square planar shape. Columnar electrodes (common columnarelectrodes, first columnar electrodes) 13 b made of copper are providedat predetermined four points on the upper surface of the wiringindicated by the sign 10 b and having a square planar shape. A columnarelectrode (second columnar electrode) 13 c made of copper is provided onthe upper surface of the connection pad portion 10 c-2 of the wiringindicated by the sign 10 c. Here, as shown in FIG. 40, a total of 16columnar electrodes 13 a, 13 b, 13 c are arranged in matrix form.

A sealing film 14 made of, for example, an epoxy resin is providedaround the columnar electrodes 13 a, 13 b, 13 c on the upper surface ofthe protective film 8 including the wirings 10 a, 10 b, 10 c. Thecolumnar electrodes 13 a, 13 b, 13 c are provided so that the uppersurfaces thereof are flush with or several μm lower than the uppersurface of the sealing film 14. The explanation of the structure of thesemiconductor construct 2 is completed now.

An insulating layer 21 in a square frame shape is provided on the uppersurface of the base plate 1 around the semiconductor construct 2. Forexample, the insulating layer 21 is made of a thermosetting resin suchas an epoxy resin in which a reinforcer of an inorganic material such assilica fuller is dispersed. Alternatively, the insulating layer 21 isonly made of a thermosetting resin such as an epoxy resin.

An upper insulating film 22 is provided on the upper surfaces of thesemiconductor construct 2 and the insulating layer 21. The upperinsulating film 22 is made of, for example, a base glass fabricimpregnated with a thermosetting resin such as an epoxy resin.Alternatively, the upper insulating film 22 is only made of athermosetting resin such as an epoxy resin. Openings 23 a, 23 b, 23 care provided in parts of the upper insulating film 22 that correspond tothe centers of the upper surfaces of the columnar electrodes 13 a, 13 b,13 c of the semiconductor construct 2.

Upper wirings 24 a, 24 b, 24 c are provided on the upper surface of theupper insulating film 22. The upper wirings 24 a, 24 b, 24 c have adouble-layer structure composed of foundation metal layers 25 a, 25 b,25 c and upper metal layers 26 a, 26 b, 26 c. The foundation metallayers 25 a, 25 b, 25 c are made of, for example, copper and provided onthe upper surface of the upper insulating film 22. The upper metallayers 26 a, 26 b, 26 c are made of copper and provided on the uppersurfaces of the foundation metal layers 25 a, 25 b, 25 c.

In this case, similarly to the wiring of the semiconductor construct 2indicated by the sign 10 c, each of the upper wirings 24 a, 24 b, 24 cincludes a connection portion, a connection pad portion, and anextension line extending therebetween. The connection portions of theupper wirings (common upper wirings, first upper wirings) 24 a, 24 b areconnected to the upper surfaces of the columnar electrodes 13 a, 13 b ofthe semiconductor construct 2 via the openings 23 a, 23 b of the upperinsulating film 22. The connection portion of the upper wiring (secondupper wiring) 24 c is connected to the upper surface of the columnarelectrode 13 c of the semiconductor construct 2 via the opening 23 c ofthe upper insulating film 22.

An overcoat film 27 made of, for example, a solder resist is provided onthe upper surface of the upper insulating film 22 including the upperwirings 24 a, 24 b, 24 c. Openings 28 a, 28 b, 28 c are provided inparts of the overcoat film 27 that correspond to the connection padportions of the upper wirings 24 a, 24 b, 24 c. Solder balls 29 a, 29 b,29 c are provided in and above the openings 28 a, 28 b, 28 c so thatthese solder balls are connected to the connection pad portions of theupper wirings 24 a, 24 b, 24 c. Here, as shown in FIG. 40, theconnection pad portions of the upper wirings 24 a, 24 b, 24 c and thesolder balls 29 a, 29 b, 29 c are only disposed around the semiconductorconstruct 2.

As described above, in this semiconductor device, the power supplyvoltage wiring 10 a and the ground voltage wiring 10 b of thesemiconductor construct 2 are solidly formed in a square planar shape,and each connected to all of the four connection pads 5 a, 5 b. Thisallows the power supply voltage wiring 10 a and the ground voltagewiring 10 b not to be burned off even if an excessively high currentruns through these wirings.

Here, the sizes of the parts of this semiconductor device are mentioned.The size of the base plate 1 is 3×3 mm. The size of the semiconductorconstruct 2 is 2×2 mm. The line width of the extension line 10 c-3 ofthe wiring 10 c of the semiconductor construct 2 is 20 μm. The diameterof the columnar electrode 13 a, 13 b, 13 c of the semiconductorconstruct 2 is 0.2 mm. The pitch of the columnar electrode 13 a, 13 b,13 c is 0.4 mm. The diameter of the opening 23 of the upper insulatingfilm 22 is 100 μm. The diameter of the connection pad portion of theupper wiring is 0.3 mm. The pitch of the connection pad portion of theupper wiring is 0.65 mm.

In the meantime, since the base plate 1 is greater in size than thesemiconductor construct 2, even if the extension line 10 c-3 of thenormal voltage wiring 10 c of the semiconductor construct 2 has arelatively small line width of 20 w, the extension line of the upperwiring 24 a, 24 b, 24 c can have a relatively great line width of about100%. This makes it possible to prevent the power supply voltage upperwiring 24 a and the ground voltage upper wiring 24 b from being easilyburned off even if an excessively high current runs through these upperwirings.

Now, one example of a method of manufacturing this semiconductor deviceis described. First, one example of a method of manufacturing thesemiconductor construct 2 is described. In this case, the ground voltageconnection pad 5 b and associated parts are substantially similar to thepower supply voltage connection pads 5 a and associated parts, and aretherefore not described.

First, as shown in FIG. 42, an assembly is prepared. In this assembly,connection pads 5 a, 5 c, a passivation film 6 and a protective film 8are formed on the upper surface of a silicon substrate in a wafer state(hereinafter referred to as a semiconductor wafer 31). Further, thecenters of the connection pads 5 a, 5 c are exposed through openings 7a, 7 c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8.

In this case, the thickness of the semiconductor wafer 31 is greaterthan the thickness of a silicon substrate 4 shown in FIG. 41. In FIG.42, zones indicated by the sign 32 are dicing streets. The parts of thepassivation film 6 and the protective film 8 corresponding to the dicingstreet 32 and both its sides are removed.

Then, as shown in FIG. 43, a foundation metal layer 33 is formed on theentire upper surface of the protective film 8 including the uppersurfaces of the connection pads 5 a, 5 c exposed through openings 7 a, 7c of the passivation film 6 and through openings 9 a, 9 c of theprotective film 8. In this case, the foundation metal layer 33 may onlybe a copper layer formed by electroless plating, may only be a copperlayer formed by sputtering, or may be a copper layer formed bysputtering on a thin film layer of, for example, titanium formed bysputtering.

Then, a plating resist film 34 made of a positive liquid resist ispatterned and formed on the upper surface of the foundation metal layer33. In this case, openings 35 a, 35 c are formed in parts of the platingresist film 34 corresponding to regions where upper metal layers 12 a,12 c are to be formed. Further, electrolytic plating with copper iscarried out using the foundation metal layer 33 as a plating currentpath, thereby forming the upper metal layers 12 a, 12 c on the uppersurface of the foundation metal layer 33 within the openings 35 a, 35 cin the plating resist film 34. Subsequently, the plating resist film 34is released.

Then, as shown in FIG. 44, a plating resist film 36 made of a negativedry film resist is patterned and formed on the upper surface of thefoundation metal layer 33. In this case, openings 37 a, 37 c are formedin parts of the plating resist film 36 corresponding to predeterminedfour points of the upper metal layer 12 a (a region where a columnarelectrode 13 a is to be formed) and corresponding to the connection padportion of the upper metal layer 12 c (a region where a columnarelectrode 13 c is to be formed).

Then, electrolytic plating with copper is carried out using thefoundation metal layer 33 as a plating current path. As a result, thecolumnar electrodes 13 a, 13 c are formed on the upper surface of theupper metal layer 12 a within the openings 37 a in the plating resistfilm 36 and on the upper surface of the connection pad portion of theupper metal layer 12 c within the openings 37 c in the plating resistfilm 36. Subsequently, the plating resist film 36 is released.

Then, using the upper metal layers 12 a, 12 c as masks, the foundationmetal layer 33 located in parts other than parts under the upper metallayers 12 a, 12 c is etched and removed. Thus, as shown in FIG. 45,foundation metal layers 11 a, 11 c remain under the upper metal layers12 a, 12 c alone. In this state, wirings 10 a, 10 c having adouble-layer structure are formed by the upper metal layers 12 a, 12 cand the foundation metal layers 11 a, 11 c remaining thereunder.

Then, as shown in FIG. 46, a sealing film 14 made of, for example, anepoxy resin is formed by, for example, the spin coat method on the uppersurface of the semiconductor wafer 31 corresponding to the dicing street32 and both its sides and on the upper surface of the protective film 8including the wirings 10 a, 10 c and the columnar electrodes 13 a, 13 cso that the thickness of this sealing film 14 is slightly greater thanthe height of the columnar electrodes 13 a, 13 c. Thus, in this state,the upper surfaces of the columnar electrodes 13 a, 13 c are coveredwith the sealing film 14.

Then, the upper side of the sealing film 14 is properly ground to exposethe upper surfaces of the columnar electrodes 13 a, 13 c as shown inFIG. 47, and the upper surface of the sealing film 14 including theexposed upper surfaces of the columnar electrodes 13 a, 13 c isplanarized. Further, as shown in FIG. 48, the lower side of thesemiconductor wafer 31 is properly ground to reduce the thickness of thesemiconductor wafer 31.

Then, as shown in FIG. 49, a bonding layer 3 is bonded to the lowersurface of the semiconductor wafer 31. The bonding layer 3 is made of adie bond material such as an epoxy resin, and is fixedly attached in asemi-cured state by heating and pressurization to the lower surface ofthe semiconductor wafer 31. Further, as shown in FIG. 50, the sealingfilm 14, the semiconductor wafer 31 and the bonding layer 3 are cutalong the dicing streets 32, thereby obtaining semiconductor constructs2 having the bonding layers 3 on the lower surface.

Now, one example of how to manufacture the semiconductor device shown inFIG. 41 using the semiconductor construct 2 shown in FIG. 50 isdescribed. In this case as well, parts associated with the groundvoltage connection pad 5 b are substantially similar to parts associatedwith the power supply voltage connection pads 5 a, and are therefore notdescribed.

First, as shown in FIG. 51, a base plate 1 is prepared. This base plate1 is made of, for example, an epoxy resin containing glass fabric as abase material, and has an area that allows the completed semiconductordevices shown in FIG. 41 to be formed thereon. For example, the baseplate 1 has, but not exclusively, a square planar shape. In addition,zones indicated by the sign 41 in FIG. 51 correspond to cut lines fordivision.

Then, the bonding layers 3 fixedly attached to the lower surfaces of thesilicon substrates 4 of the semiconductor constructs 2 are bonded tosemiconductor construct placement regions on the upper surface of thebase plate 1 to leave space in between. In this bonding, the bondinglayers 3 are fully cured by heating and pressurization.

Then, as shown in FIG. 52, a lattice-shaped insulating layer formationsheet 21 a is positioned by, for example, pins and thus disposed on theupper surface of the base plate 1 around the semiconductor construct 2.The lattice-shaped insulating layer formation sheet 21 a is prepared bydispersing a reinforcer in a thermosetting resin such as an epoxy resin,semi-curing the thermosetting resin into a sheet form, and formingsquare holes in the sheet by, for example, punching.

Then, an upper insulating film formation sheet 22 a is disposed on theupper surfaces of the semiconductor construct 2 and the insulating layerformation sheet 21 a. The upper insulating film formation sheet 22 a isprepared by impregnating, for example, glass fabric with a thermosettingresin such as an epoxy resin, and semi-curing the thermosetting resininto a sheet form.

Then, the insulating layer formation sheet 21 a and the upper insulatingfilm formation sheet 22 a are heated and pressurized from the top andbottom using a pair of heating/pressurization plates 42, 43. Bysubsequent cooling, an insulating layer 21 in a square frame shape isformed on the upper surface of the base plate 1 around the semiconductorconstruct 2, and an upper insulating film 22 is formed on the uppersurfaces of the semiconductor construct 2 and the insulating layer 21.In this case, the upper surface of the upper insulating film 22 ispressed by the lower surface of the upper heating/pressurization plate42, and is therefore a flat surface.

Then, as shown in FIG. 53, by laser processing to radiate a laser beam,openings 23 a, 23 c are formed in parts of the upper insulating film 22that correspond to the centers of the upper surfaces of the columnarelectrodes 13 a, 13 c of the semiconductor construct 2.

Then, as shown in FIG. 54, a foundation metal layer 44 is formed on theentire upper surface of the upper insulating film 22 including the uppersurfaces of the columnar electrodes 13 a, 13 c of the semiconductorconstruct 2 that are exposed through the openings 23 a, 23 c of theupper insulating film 22. In this case as well, the foundation metallayer 44 may only be a copper layer formed by electroless plating, mayonly be a copper layer formed by sputtering, or may be a copper layerformed by sputtering on a thin film layer of, for example, titaniumformed by sputtering.

Then, a plating resist film 45 is patterned and formed on the uppersurface of the foundation metal layer 44. In this case, openings 46 a,46 c are formed in parts of the plating resist film 45 corresponding toregions where upper metal layers 26 a, 26 c are to be formed. Further,electrolytic plating with copper is carried out using the foundationmetal layer 44 as a plating current path, thereby forming the uppermetal layers 26 a, 26 c on the upper surface of the foundation metallayer 44 within the openings 46 a, 46 c in the plating resist film 45.

Then, the plating resist film 45 is released. Further, using the uppermetal layers 26 a, 26 c as masks, the foundation metal layer 44 locatedin parts other than parts under the upper metal layers 26 a, 26 c isetched and removed. Thus, as shown in FIG. 55, foundation metal layers25 a, 25 c remain under the upper metal layers 26 a, 26 c alone. In thisstate, upper wirings 24 a, 24 b are formed by the upper metal layers 26a, 26 c and the foundation metal layers 25 a, 25 c remaining thereunder.

Then, as shown in FIG. 56, an overcoat film 27 made of, for example, asolder resist is formed by, for example, the screen printing method orspin coat method on the upper surface of the upper insulating film 22including the upper wirings 24 a, 24 c. In this case, openings 28 a, 28c are formed in parts of the overcoat film 27 that correspond to theconnection pad portions of the upper wirings 24 a, 24 c.

Then, solder balls 29 a, 29 c are formed in and above the openings 28 a,28 c of the overcoat film 27 so that these solder balls are connected tothe connection pad portions of the upper wirings 24 a, 24 c. Further, asshown in FIG. 57, the overcoat film 27, the upper insulating film 22,the insulating layer 21 and the base plate 1 are cut along the cut lines41 between adjacent semiconductor constructs 2, thereby obtainingsemiconductor devices shown in FIG. 41.

Fifth Embodiment

FIG. 58 shows a transmitted plan view of a semiconductor deviceaccording to a fifth embodiment of the invention. FIG. 59 shows asectional view of a proper part of the semiconductor device shown inFIG. 58. This semiconductor device is different from the semiconductordevice shown in FIG. 40 and FIG. 41 in that a solidly-formed powersupply voltage upper wiring 24 a and a solidly-formed ground voltageupper wiring 24 b are provided instead of the above-mentioned powersupply voltage upper wiring 24 a and the ground voltage upper wiring 24b. The power supply voltage upper wiring 24 a is provided in a regionthat includes four power supply voltage columnar electrodes 13 a andincludes places where four power supply voltage solder balls 29 a arearranged. The ground voltage upper wiring 24 b is provided in a regionthat includes four ground voltage columnar electrodes 13 b and includesplaces where four ground voltage solder balls 29 b are arranged.

As described above, since the power supply voltage upper wiring 24 a andthe ground voltage upper wiring 24 b are solidly formed in thissemiconductor device, the upper wirings 24 a, 24 b can be reduced inresistance, and current capacity can thus be improved, as compared withthe semiconductor device shown in FIG. 40 and FIG. 41.

Sixth Embodiment

FIG. 60 shows a transmitted plan view of a semiconductor deviceaccording to a sixth embodiment of the invention. This semiconductordevice is different from the semiconductor device shown in FIG. 58 inthat nine power supply voltage columnar electrodes 13 a are provided inmatrix form on the upper surface of a solidly-formed power supplyvoltage upper wiring 24 a and in that nine ground voltage columnarelectrodes 13 b are provided in matrix form on the upper surface of asolidly-formed ground voltage upper wiring 24 b.

Thus, since this semiconductor device has nine power supply voltagecolumnar electrodes 13 a and nine ground voltage columnar electrodes 13b, the parts corresponding to the columnar electrodes 13 a, 13 b can bereduced in resistance as a whole, and current capacity can thus beimproved, as compared with the semiconductor device shown in FIG. 58 andFIG. 59. In this case, the pitch of the columnar electrodes 13 a, 13 bis, by way of example, 0.25.

Seventh Embodiment

FIG. 61 shows a sectional view of a semiconductor device according to aseventh embodiment of the invention. This semiconductor device isgreatly different from the semiconductor device shown in FIG. 41 in thattwo upper insulating films and two upper wirings are provided. That is,on the upper surface of a first upper insulating film 22A including afirst upper wiring 24A, a second upper insulating film 22B made of thesame material as the first upper insulating film 22A is provided. On theupper surface of the second upper insulating film 22B, a second upperinsulating film 24B similar in structure to the first upper wiring 24Ais provided.

One end of the first upper wiring 24A is connected to a columnarelectrode 13 via an opening 23A of the first upper insulating film 22A.One end of the second upper insulating film 24B is connected to theconnection pad portion of the first upper wiring 24A via an opening 23Bof the second upper insulating film 22B. A solder ball 29 is connectedto the connection pad portion of the second upper insulating film 24Bvia an opening 28 of an overcoat film 27. In addition, three or moreupper insulating films and three or more upper wirings may be provided.

Additional advantages and modifications will readily occur to thoseskilled in the art. Therefore, the invention in its broader aspects isnot limited to the specific details and representative embodiments shownand described herein. Accordingly, various modifications may be madewithout departing from the spirit or scope of the general inventiveconcept as defined by the appended claims and their equivalents.

What is claimed is:
 1. A semiconductor device comprising: asemiconductor substrate; integrated circuits formed on an upper surfaceof the semiconductor substrate; connection pads provided on thesemiconductor substrate which are connected to the integrated circuits,the connection pads comprising common power supply voltage connectionpads, common ground voltage connection pads, and normal voltageconnection pads; a passivation film provided on the upper surface of thesemiconductor substrate and having openings in regions corresponding tothe connection pads; a protection film provided directly on an uppersurface of the passivation film and having openings in regionscorresponding to the connection pads; at least one first common wiringserving for a power supply voltage and provided solidly and directly onan upper surface of the protection film so as to be connected to thecommon power supply voltage connection pads via corresponding openingsin the protection film and the passivation film; at least one secondcommon wiring serving for a ground voltage and provided solidly anddirectly on the upper surface of the protection film so as to beconnected to the common ground voltage connection pads via correspondingopenings in the protection film and the passivation film; and at leasttwo normal wirings each provided directly on the upper surface of theprotection film so as to be connected to a normal voltage connection padamong the normal voltage connection pads via a corresponding opening inthe protection film and the passivation film.
 2. A semiconductor devicecomprising: a semiconductor substrate; integrated circuits formed on anupper surface of the semiconductor substrate; connection pads providedon the semiconductor substrate which are connected to the integratedcircuits, the connection pads comprising common voltage connection padsand normal voltage connection pads; a passivation film provided on thesemiconductor substrate and having openings in regions corresponding tothe connection pads; at least one common wiring provided solidly on thepassivation film so as to be connected to the common voltage connectionpads via corresponding openings in the passivation film; at least twonormal wirings each provided on the passivation film so as to beconnected to a normal voltage connection pad among the normal voltageconnection pads via a corresponding opening in the passivation film; atleast one first electrode provided on the at least one common wiring; atleast two second electrodes provided on connection pad portions of theat least two normal wirings, respectively; an upper insulating filmhaving at least one first opening in a part corresponding to the firstelectrode and at least two second openings in parts corresponding to thesecond electrodes; at least one first upper wiring provided to beconnected to the first electrode via the first opening; and at least twosecond upper wirings provided to be connected to the second electrodesvia the second openings.